Permitir a administradores configurar tarifa plana de patrocinio y consultar cubo de gasto de exploradores

[JaviFdez7]

An actor who is authenticated as an administrator must be able to:

• Configure a flat rate for sponsorships.
• Launch a process to compute a cube of the form M[e, p] that returns the amount of money that explorer e has spent on trips during period p, which can be M01-M36 to denote any of the last 1-36 months or Y01-Y03 to denote any of the last three years.
• Consult the cube by means of the following queries:
  • Given e and p, return M[e, p].
  • Given p, return the explorers e such that M[e, p] q v, where v denotes an arbi-trary amount of money and q is a comparison operator (that is, “equal”, “not equal”, “greater than”, “greater than or equal”, “smaller than”, or “smaller than or equal”).